Contactor can be easily retro-fitting auxiliary contact group, and appropriate combination of thermal relay to protect the load that may have been circuits.

接触器还可方便地加装辅助触头组，和适当的热继电器组合，保护可能发生过负载的电路之用。

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First, you should always protect against your machine — the one serving your Web content to millions of users — from being used as a mail relay.

首先，应当始终防止您的机器(为数百万个用户提供Web内容的机器)成为一个邮件中转站。

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How to promote the right action rate of the Relay protect equipment is the most important and difficult problem of the power dispatch and communication system.

如何提高继电保护装置的正确动作率，一直是调度通信系统的重点技术难题之一。

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